Frederick hermann



FREDERICK HERMA-NN, OF GRAFTON, MICHIGAN.

Letters Patent'No. 66,960, dated July 23, 1867.

IMPROVEMENT IN GROSS-HEADS FOR SAW-MILLS.

T ALL WHBI IT. rMAY CONCERN:

Beit known that I, FREDERICK HERMANN, of Grafton, in the county of Monroe, and State of Michigan, have invented a new and useful Improvement in Cross-Heads for Saw-Mills, and all other `machinery where such mechanical devices are used and I do hereby declare that the followingis a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in whichj Figure 1- is a perspective view of my invention, showing all the essential working parts outwardly, except the guides, which are shown in g. 2. j

Figure 2 is 4a view of one of the guides in perspective.

Figure 3 is a vertical section of one of the slides or travellers, showing the arrangement of the frictionwheels and other details.

Figure 4 is a. vertical section of one of thewheel's longitudinally through the axle, showing thc concavity in the sides of the wheel, and the convexity of the journal-box corresponding.

Figure 5 is a plane view of the top of one of the slides or travellers, with the cap on to keep out the dirt from the lubricating tubes.

Figure 6 is a plane view of the top of both slides with the cap o, showing the entrance to the lubricating tubes, and also the tread of the wheels d upon the inner surfaces of the guides z.

Similar letters of reference are for like parts in all the figures.

The object of my invention is to lessen the friction of the bearing parts of the cross-head, and also to shut away the sand, saw-dust, and all other obstructions from the lubricated parts, or, in other words, to remove the necessity for lubrication from the ordinary bearing parts to within a boxing device where all, or nearly all, the friction takes place in my invention. In the common cross-head the friction is all on the guides and sliding parts; In this it is on the journals of the wheelsd. Also to preclude the necessity for the frequent renewals of the bearing parts, as in the old way, especially in saw-mill machinery.

To enable others skilled in the art to understand and make my invention, 'I will describe it.

A guide, iig. 2, ismatle for each side a of the sliding part in the form of a square, oblong trough, open at the ends, in which the parts a a travel from end to end. The slides are composed of a face, b, and two slabs, cc, of metal or wood, all firmly clamped together with bolts, capped over at the top with. protecting plates, iig. 5, and provided with friction-wheels d and lubricating tubes e. Through or into these slides a a the axle or noddle-pinf passes, equidistant from the ends, an/d on the centre of the-noddle-pin rests the pitman or main connecting-rod g, as the case may be. The friction-wheelsare set into the slabs c c, whollyin one, as in iig. 3, or half in each, as in iig. 4. They are made to project from the surface of the boxing, as shown at (Z, sutliciently to bear on the inner surfaces ofthe guides, fig. 2, and leave the said surfaces entirclyclear of the slides. The friction-wheels are set obliqnely, or rather only partially opposite to each other, as seen at d d, iig. 3, but tread upon the faces in juxtaposition, as seen in iig. 3, so as to take up the wear of `the journals and journalboxes by following up the enlargement with the guides, which is accomplished by closing together the jaws h of the guides. This is readily done by diminishing the thickness of the furrcwing t'. The wheels are also b'evelled o r made concave between the axle andthe face or tread, so as to give considerable axle bearing without the inconvenient lengthening of the axle laterally. The bevel is shown by the vertical section through the wheel. (See iigt 4.) This gives enough of bearing surface to the tread of the wheel, and also to the journals l within a limited length of axle. The tops of the slides a are covered with a plate, iig. 5, to keep the dirt out of the oil-tubes, and to keep in thc oil, which would be thrown out by the violent motion of the slides in their journey to and fro. In iig. 6 these tubes are shown at e; also by the dotted lines in fig. 3.

In the common cross-head the friction is very great because of the great surface acted on, and this is greatly increased by the dirt, which sticks fast in the oil, and from this cause the parts wear rapidly away and gutter out in fnrrows, and need renewing often, especially in saw-mills, where much dirt from the bark is thrown down by the saw directly on to the cross-head, and the saw-dust drinks up the oil and clogs the slides so as to greatly increase the friction. But in my invention the oil is shut up in the box a, and the wheels need no oil; at least, considering the dirt, they work better without it. This device also relieves the bearing parts almost entirely from heat, which is often very great in the old method. In using the old method in a sawmill the slides require renewing as often sometimes as every day, at least the faces, on'nceount of the extraordinaryvheat and wear, at a great loss of time in the use of the mill, while with. this plan they do not require replacing for many months, and in .some cases even for years. i

I disclaim the mere use of the common friction-wheel in any other method of hanging not substantially the same as specified.

Having described my invention, I claim, and desire to secure-by Letters Patentl The combination of the wheels d, igs. 1', 3, 4, 6, with the peculiar and novel method of hanging the saine by means of the boxing device shown in figs. 1, 3, 4, 6, for the purposesand in the manner specified.

FREDERICK HERMANN.

Witnesses:

L. H. REYOLDS, R. J. KING. 

